University of Glasgow

University of Sheffield

Qd Laser, Inc.

Finisar UK Limited

Richard Hogg

Kristian Michael Groom

Mitsuru Sugawara

Kenichi Nishi

Keizo Takemasa

Siming Chen

Richard James Edward Taylor

Richard Taylor

David Timothy Dylan Childs

David T D Childs

Benjamin James Stevens

David Childs

Takeo Kageyama

A laser device has a photonic crystal surface emitting laser (PCSEL) element. At a first lateral side of the PCSEL element, a reflector is arranged to reflect back into the PCSEL element at least a portion of light travelling out of the PCSEL element through the first lateral side of the PCSEL element. Between the first lateral side of the PCSEL element and the reflector there is interposed an electrically controllable light-transmission region configured to control the transmission of light from the PCSEL element to the reflector, based on an electrical input. Also disclosed is a method of operation of a corresponding laser device.

Laser device and method for its operation

A laser structure comprising a first photonic crystal surface emitting laser (PCSEL), a second PCSEL, and a coupling region that extends between the first PCSEL and the second PCSEL along a longitudinal axis and that is electrically controllable so as to be capable of coherently coupling the first PCSEL to the second PCSEL. Each PCSEL include an active layer, a photonic crystal, and a two-dimensional periodic array distributed in an array plane parallel to the longitudinal axis within the photonic crystal where the two-dimensional periodic array is formed of regions having a refractive index that is different to the surrounding photonic crystal.

Laser structure

A semiconductor light-emitting element includes: a lower clad layerthat is provided on a substrate; an active layerthat is provided on the lower clad layerand includes a quantum well layerand a plurality of quantum dotssandwiching a second barrier layertogether with the quantum well layer; and an upper clad layerthat is provided on the active layer, wherein a distance D between the quantum well layerand the plurality of quantum dotsis smaller than an average of distances X between centers of the plurality of quantum dots

Semiconductor light-emitting element

A multisection quantum dot laser () comprising at least first () and second () sections, each section () comprising a semiconductor substrate () comprising p () and n type () layers and a quantum dot layer sandwiched therebetween; the semiconductor substrate () comprising a back electrical contact in electrical contact with one of the p and n type layers and a tuning electrical contact () in electrical contact with the other of the p and n type layers; the quantum-dot layers of the first () and second () sections being portions of the same quantum dot layer () forming a laser cavity.

Methods of modulating a quantum dot laser and a multisection quantum dot laser

Embodiments of the present invention provided a method of fabricating a semiconductor light source structure. The method comprises providing a GaAs substrate; forming a lower cladding layer above the substrate, the lower cladding layer comprising an AIGaAs alloy; forming an active region above the lower cladding layer, the active region comprising a GaAs separate confinement heterostructure; and forming an upper cladding layer comprising an AIGaAs alloy above the active region in the form of an elongate stripe bounded on either side by an InGaP current-blocking layer, the elongate stripe defining an index-guided optical waveguide. The stripe is formed such that at least one free end of the stripe is spaced apart from an edge of the substrate in a direction parallel to a longitudinal axis of the stripe such that a portion of the lower cladding layer, active region, current blocking layer and upper cladding layer extend beyond the at least one free end of the stripe thereby to provide an unpumped and laterally unguided window region.

Semiconductor light source and method of fabrication thereof

Growing community of inventors

Sheffield, United Kingdom

Richard Hogg